Question

A homeowner is draining her swimming pool. The volume of water in the pool changes by −12 gallons every minute.

Answer 1

The drainage rate is -12 gallons / minute.

To answer this question, multiply -12 gallons / minute by 60 minutes.

That comes to -720 gallons, the volume by which the water in the pool decreases in an hour.

Answer 2

So, water decreases by 12 gallons EVERY minute.

How much water will decrease in 60 minutes?

$12*60=720$ gallons

So, the volume changes by 720 gallons in 60 minutes.

ANSWER: Volume decreases 720 gallons in 60 minutes.